Apparatus for forming hollow articles by dies.



,H. G. CARLSON.

APPARATUS FOR FORMING HOLLOW ARTICLES BY DIES.,

APPLICATION FILED 050.28. 1914.

1,156,972. Patented 00t.19,1915.

2 SHEETS-SHEET 1- Inventor g gf I fllaaimiz ,b S 5% I, m of Wm y Am H.G; CARLSON.

APPARATUS FOR FORMING HOLLOW ARTICLES BY DIES.

. APPLICATION FILED DEC.23, 1914. 1,156,972.

Patented Oct. 19, 1915.

2 SHEETS-SHEET 2.

r Inventor" ULdnessew- 6 016 .1%77;r-. z shmmazz 1?. (7 WM Attorneys.

COLUMBIA FLANOGRAIH c0.. WASHINGTON D. c

HJALMAR' e. cennson, onwonqnsrnn MAssaeirUsETTs, essrcnon no, itocirwoonSPRINK ER COMPANY, OF MA A SET el Conronerron or MASSACHUSETTS.

A AT sFonFoR-nm-G LLOW enric es i' ma er To all whom it may concern: 1Be it known that I, HJ LMAR G; Game son, a citizen of the UnitedStates,resldlng at WVorcester, in the county of Worcesterand State ofMassachusetts, have invented a new and useful Apparatus for FormingHollow Articles by Dies, of which the fol-..

lowing is a specification. I V y This invention relates to an apparatusfor forming articles from sheet metal by means of dies. a i z Theprincipal objects of the invention are to provide for eliminating thereheating, or annealing: process, v heretofore, necessarily employed, indrawing out'sheet metal blanks into th'eform of hollow tubular orpolygo-f nal parts; to providean arrangement ofdies by which thereheating and annealing steps 7 are avoided; to provide an arrangement,of

view of a die bed, punch block, 'a nd set of dies connected therewith,arranged in ac-f cordance with this invention; Fig. 2 Isiaplan of thedie bed and dies thereon showing 7 the die punches in transversesection;3

I is a plan of the reducing die Fig. a is a plan of-the finishing die;Fig 5is a perspective view of the cup sha ped blankj'and Fig. 6, is 7ventionjisshown asapplied to ardie' press-Q having the usual die bed 10secured in posit tion by bolts 11, or in anyother desired way, Thiscooperates with a punch block 12,. mounted on ai-plungerand adapted torecipgio'o rocate therewith This punch; bl0olr,- as

a similar view ofthe product. i

This invention relates to that class a of Work in which sheet' metalblanks are cut out to a convenient shape .and then cupped and finallyelongated and' 'shaped for the purpose of producinghollow articles, suchasshells and; the like, of polygonal or even cylindricaliorm, but of e alength considerably greater. than that of the first cuppedout blank.Heretofore, so far as 'I am aware, articles of this kind have beenproduced by, a series of'dieingoperationsf. A

special 'set' of dies has been'nec'es'sary forv number of recesses -15,adapted :v o ,:be "lo-*- cated directly under the punches Each; re- 116each operation. and consequently as .ecial fmachiner This-necessitatedthe per orm-e Specification of Letters ity of sets-of dies, Thisw'as dueto the fact proper position by placingqthepreviously and then shiftingthe-diebed until'it' -was thepunch Obviously, this operation-could eperformed so as perfectly-zto registeru of femaledies. 1

P tented a 19,1515,

Application filed December-28,1914; Serial No. 879,339. 1

w ance of these operations, one at atime, and

the cooling of the blanks between each'oper ation and the subsequentone. As' it was" necessary. to have the blank in as soft a con- 'd 'tionas POSSlblGlIl' order that "each @pem-- tion inlight be performedefliciently, the blanks were put in an oven and reheated just beforeeach operation.- This necessarily I added materlallyto the expense ofthe whole" I procedure and necessitated the *handlingof 5 V the-blanksin a certaindefinite manner. If there was any long interruptionin the se'-' ries of operations, an additional heating had to hB-glVGIlto the blanks; f i

Another difficulty which has interfered with the speeding .up' ofthese-operations,

has =bee'n'the' fact thatsojfar as'l'amaware, i

it'has always been impossible to carry out--- these, operations on apress having "alzplurale that each die bed-was made so thatthe die'iwhich it carried could be clamped thereon or released so thatit couldbe,replaced,- but i so thatit alwaysoocupied; the'same position i onthebed. The-parts were set up in the formed articleon the'end ofthepunch and v bringing thegpunch down into the female die broughtto aperfect center :with respect tonot two or morepunches; with'acorresponding J One of.v the objectso'jfl this invention to provide .asimple andpr-acticable ar-ranges.

l-ment wherebygroupsof dies can be mount;

"ed; on the same machine. and accurately cen- V tered, each with its ownpunch Referring now. to the drawings, theiinhown in the present case,-is prov de ith .7 two die punches 13! :Each of these is:

they are octagonal in 11501111;

' The. di, bedis provide with the so a cess is provided as usual with apassage 16 for receiving the end of the punch. In each of these recesses15 is placed a die member 17 smaller in size than the recess. Preferablythe recess and die member are both circular. For the purpose ofaccurately centering each of these die members and securing them-inadjusted positions, adjusting screws 18 are provided, preferably threein number. 7

' Above each die member'l'? isa second die member 19 having a centraldepression 20 for centering it on a projection 21 on the die member 17.This, as will appear, is the reducing die, While the die 17 is thefinishing 'die.

to permit of the necessary adjustments.

it is to be noted that each reducing die has a central openingtherethrough of circular cross section, flaring out at the top to assistin guiding the cup-shaped blank into position. In this way the operationof the punch in the reducing die-is to elongate the blank and reduce itsdiameter.

The finishing'die is provided with a central perforation registeringwith and, preferably as shown, forming a continuation of the passagethrough the reducing die. It is flared out at the top to a diameterequal to that of the bottom oi the passage in the reducing die. Theupper portion of the pas: sage in the reducing die is circular, but 1t18" gradually reduced to the desired polygonal formand retains that formto the bottom.

In the form shown, it is of course of the same shape as the punch 13,but of larger size. The difi'erence represents the thickness of themetal of the article to be produced.

In operation, the diebed is fastened in. position approximatelycentrally with re-' 'The bolts 2 1 are then tightened to scour them intheir proper places.

The operation of reducing an article is as follows: A flat piece ofsheet steel, or other metal is punched out to the desired circular form.It is then preliminarily operated upon in an ordinary set of dies toform a shallow cup A. Two of these cups, preferably while cold, areplaced by hand on the tops of the two dies 20 and the punches broughtdown. The first effect of the punching operation is to simultaneouslyreduce these two cups in the reducing dies and at the same time elongatethem. This, accord ing to the old system, would be the end of this stepof the operation and the blanks thus reduced would be taken out of themachine and thrown aside to be reheated when ready to go through theneXt operation. But according to my invention, reheating does not haveto be done because I have discov- 'ered that the operation of reducingjust described imparts enough heat to the blank to permit ofits beingintroduced immediately into the finishing dies and finished, provided itis not allowed to cool on". Consequently, by my procedure, ll not onlyre duce the blank, but the continuous motion of the punch, I force theheated blank into the finishing die and finish it at the same heat.' Tnthis way, no reheating has to be done after the blank is firstintroduced into the'reducing die. It will be seen in this way that byuse of two punches, four operations are simultaneously performed, namelytwo reducing and two finishing operations, where only one reducing orone finishing operation has been practicable heretofore, andfurthermore, the delay and expense of the usual reheating between thereducing and finishing operations is entirely eliminated. Even thereheating ovens can be dis pensed with in some factories.

Although I have illustrated and described only a single form of theinvention and shown it as applied to the manufacture of an article ofonly one shape, I am aware of the fact that the invention can be carriedout in many other forms and applied to many other articles withoutdeparting from the scope of the invention as expressed in the claims.Therefore, I do not wish to be limited in these respects, but

What I do claim is 1. In a device for producing hollow articles fromsheet metal blanks, the combination of a'die, a second die locatedadjacent ment with each other, both dies having passages therethrough,the passage in the first the being larger than the .passage in thesecond die and of difi'erent shape, a punch movable through, thepassages in both dies, and means connected with the dies for centeringthem with respect'to each other.

3. In a device for producing hollow articles from sheet metal blanks,the combination of a reducing die having a passage therethroughofcircular cross section and flared out at the entrance end, and a seconddie centered with respect tothe reducing die and provided with a passagesmaller than the passage in the reducing die andof r the reducing die,means cooperating with.

1 inner die, and means for adjusting the innerpolygonal cross sectionand flaring out at the surface nearest the reducing die and formed atthe surface of substantially the same shape as that of the passagethrough said dies for centering them with respect to each other, and apunch adapted to pass through the reducing die into the second die andhaving a cross section similar to the cross section of the passagethrough the second die. 7 r

4. In a device of thecharacter described, the combination of adie bedhaving a recess in its face, an inner die adapted to be received in saidrecess and provided with a passage therethrough, an outer die having apassage therethrough larger than the passage in the inner die andcentered on said being seated at the bottom of the recess,

means for adjusting the last-named dies in 7 their respective recessesand securing them in adjusted positions, and aplunger blockhaving aseries of punches in fixed position thereon, .one for each set of dies.

6. Ina device of the character described,

the combination of a die bed having a recess inits' face, an inner dieadapted to be received in said recess andvprovided with a passagetherethrough,an outer die having a passage therethrough and centeredon'sald inner die, means for ad usting the nner die in said recess andsecuring it in adjusted; position, means for clamping the second 'die Yof d1es. v

in its adjusted position, the last named means being arranged to permitthe outer die to move. while the inner die is being adjusted, and apunch movable through both I dles.

7. In a device of the character described,

the combination of a; die bed h'avinga plurality of recesses therein, aplurality of (lies arranged: in each recess, one dieof each set beingseated at the bottom of the recess,

means'fo-r adjusting the last named diesin their respective recessesoandsecuring them in adjusted positions, a punch block having a seriesofpunches in fixed position thereon, one for eachset of-dies, a platefor an outer die of each sethavingmeans for receiving and holding theouter die, and means for fastening it to the'die-bed, each of said:plates and its fastening means being ar ranged to'move with the inner.die while being adjusted.

8. In a device of the character described, the combinationof a diebedhaving a plurality of recesses in its face, finishing dies arrangedmovablyinsaid recesses, screws in said die bed for adjusting and holdingthe finishing dies in position 'in'the recesses, a punch block having aseries of punches adapted to enter said finishing dies and center thesame, a corresponding series of reducing dies, eachfinishing andreducing die having a central projection and depression fitting, eachother, by which the reducing dies are centered with respect'to thefinishing dies, a series of plates having perforations for receiving thereducing dies, and means relatively movable with respect 7 to saidplates for clamping them in position after the dies are centered.

so f

9. In a device of the character described, j the combi'nation'of a diebed, an inner die provided with a passage therethrough, an

outer die having a passage therethrough and justing the inner die andsecuring it in adjusted position, means for clamping the second die inits adjusted position, the last 10. -The combination of die bed, aplurality of sets of dies arranged thereon,

and a punch movable centered on said inner die, means for admeans foradjusting the dies individually p' and securing them in adjustedpositions, and v a plunger: block having a series of plungersin fixedposition thereon, one for each set In testimony whereof I have hereuntoset. my hand, in the presence of two subscribing witnesses. I j

j HJALMAR G. oARLsoN,

I Witnesses: I

, ALBERT E. FAY,

v C. FORREST WESSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Batents, f i

i v Washington, D. Q.

